WO2017145696A1 - フェロコークスの製造方法 - Google Patents

フェロコークスの製造方法 Download PDF

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WO2017145696A1
WO2017145696A1 PCT/JP2017/003889 JP2017003889W WO2017145696A1 WO 2017145696 A1 WO2017145696 A1 WO 2017145696A1 JP 2017003889 W JP2017003889 W JP 2017003889W WO 2017145696 A1 WO2017145696 A1 WO 2017145696A1
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coke
ferro
raw material
mass
strength
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PCT/JP2017/003889
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English (en)
French (fr)
Japanese (ja)
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祐樹 岩井
藤本　英和
孝思 庵屋敷
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Ｊｆｅスチール株式会社
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Priority to KR1020187024308A priority Critical patent/KR102205814B1/ko
Priority to JP2017513270A priority patent/JP6384598B2/ja
Publication of WO2017145696A1 publication Critical patent/WO2017145696A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • C10B53/08—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form in the form of briquettes, lumps and the like
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition

Definitions

  • the present invention relates to a method for producing ferro-coke that can improve the strength of ferro-coke or the reactivity of ferro-coke by using return ore as a raw material for ferro-coke.
  • the iron source used for the iron making raw material is in the form of a lump ore or sintered ore and can be charged as a raw material in a blast furnace, as well as fine iron ore, sintered powder, dust, mill scale, etc.
  • a powdery thing If these powdery raw materials are charged into the blast furnace as they are, the air permeability in the furnace is deteriorated.
  • various technologies have been developed, and one of them is a technology in which a powdered iron raw material is mixed with powdered coal, reduced, and charged into a blast furnace as ferro-coke.
  • Ferro-coke reacts at a lower temperature than normal coke because iron mixed therein catalyzes and is more reactive than normal coke. Since the ferro-coke reaction is an endothermic reaction, the heat storage zone temperature of the blast furnace can be lowered, the reduction of the sintered ore can be promoted in the blast furnace, and the reducing material ratio can be lowered.
  • Patent Document 1 proposes a method for increasing the strength of ferro-coke by adjusting the maximum particle size of iron ore.
  • Patent Document 2 discloses a method of maintaining the strength of ferro-coke while improving the reactivity with coke by setting the blending amount of iron to 0.05 to 5% by mass.
  • Patent Document 3 discloses a method for producing ferro-coke by mixing raw materials mainly composed of coal and a return mineral having a particle size of 3 mm or less and subjecting them to dry distillation.
  • the maximum particle size of iron ore is specified to produce high-strength ferrocoke while maintaining the reduction rate of iron ore. Not considered.
  • the method described in Patent Document 2 has a problem that the compounding amount of iron is small and the reactivity of ferrocoke is poor.
  • the method described in Patent Document 3 has a problem that the reactivity of ferrocoke cannot be improved because the particle size of the return mineral is as large as 3 mm or less.
  • a ferro-coke manufacturing method in which coal and iron raw material are mixed to form a mixed raw material, and the mixed raw material is molded and dry-distilled, wherein the iron raw material has a ratio of particulates having a diameter of 0.5 mm or less Is a return ore within a range of 40 to 70% by mass, and the iron raw material is used at a ratio of 2 to 10% by mass with respect to the mass of the mixed raw material.
  • the ferro-coke production method according to the present invention can produce ferro-coke with improved reactivity while maintaining the target strength, or ferro-coke with improved strength while maintaining the reactivity of ferro-coke.
  • ferro-coke is produced using the return ore that is the product sieve in the sintering process.
  • the return ore is a sintered ore that has been sieved under a sieve having a predetermined particle size that does not satisfy the particle size of the sintered ore, for example, a sieve having an opening of 5 mm.
  • Returning ore is usually reused as a sintering raw material, but in the present invention, a part of it is used as a raw material for ferrocoke. Compared to iron ore, limestone is contained in the return ore, so Ca is contained in its components.
  • ferro-coke is more reactive than coke is that Fe contained therein functions as a catalyst for gasification reaction, but Ca also acts as a gasification reaction catalyst. And the catalytic action of Ca acts independently of Fe. For this reason, the reactivity of the ferrocoke which contains Ca in addition to Fe improves dramatically compared with the ferrocoke which contains Fe and does not contain Ca.
  • ferro-coke As a method for producing ferro-coke according to the present embodiment, a method for producing ferro-coke capable of enhancing the reactivity of ferro-coke while maintaining the strength of ferro-coke at a certain level or higher will be described first.
  • Ferro-coke reactivity increases as the particle size of the iron raw material decreases.
  • the iron raw material after pulverization has a particle size distribution, it cannot be generally discussed only with the average particle size.
  • the inventors of the present invention have a great influence on the reactivity of ferrocoke, and the diameter of the sieving with a mesh opening of 0.5 mm is 0.5 mm or less (in the following description, “ ⁇ 0. It has been found that the ratio of the granular material to be described as “5 mm” greatly affects the reactivity of carbon in ferrocoke.
  • FIG. 1 is a graph showing the relationship between the ratio of granular material of iron raw material of ⁇ 0.5 mm and the reactivity of ferrocoke.
  • the horizontal axis represents the ratio (% by mass) of the granular material of iron raw material of ⁇ 0.5 mm
  • the vertical axis represents the carbon reaction rate (%) in ferrocoke.
  • the reaction rate of carbon in ferrocoke was calculated as a mass change rate of carbon before and after the test by performing a load softening test of ferrocoke.
  • a load softening test as shown in FIG. 4, in the load softening test apparatus shown in FIG. 4, a sample in which the periphery of one ferro-coke 10 is surrounded by 350 g of sintered ore 12 and the coke 14 is arranged above and below is installed. 5, each sample was heated to 1200 ° C. with the temperature rising pattern shown in FIG. 5, and a mixed gas having a gas composition changed at a predetermined temperature as shown in FIG. 7 while applying a load with the load pattern shown in FIG. It carried out by blowing at a flow rate of min. Then, the amount of carbon in the ferrocoke before the test and the amount of carbon in the ferrocoke after the test were measured by chemical analysis of carbon, and the mass change rate of the carbon before and after the load softening test was calculated using this. .
  • the evaluated ferro-coke is an egg-shaped mixture of 30 mm ⁇ 25 mm ⁇ 18 mm in a mixed raw material in which an iron raw material in a proportion of 30% by mass is mixed with coal based on the mass of the mixed raw material in which coal and iron raw material are mixed. Molded into briquettes and then produced by dry distillation.
  • the white circle plot shows the result of ferro-coke using iron ore as an iron raw material.
  • the black circle plot shows the result of ferro-coke using iron ore as the raw material.
  • the ratio of the iron raw material to the mass of the mixed raw material is preferably in the range of 2 to 40% by mass. This is because if the ratio of the iron raw material is less than 2% by mass, the reactivity of the ferrocoke will be low, and if it is higher than 40% by mass, the strength of the ferrocoke will be low.
  • Fig. 1 shows that ferro-coke using return ore has higher carbon reaction rate and ferro-coke reactivity than ferro-coke using iron ore as an iron raw material.
  • the return ore contains Ca, which acts as a carbon gasification reaction catalyst. Due to the catalytic effect, it is considered that the reaction rate of carbon is improved in ferro-coke using return ore as a raw material compared to ferro-coke using iron ore as a raw material. From Fig.
  • the upper limit of the carbon reaction rate is about 30%, but in the case of ferro-coke using return ore as a raw material, if the ratio of -0.5 mm is 25 mass% or more, The reaction rate of carbon more than ferrocoke using iron ore as a raw material can be obtained.
  • FIG. 2 is a graph showing the relationship between the ratio of granular materials of iron raw material of ⁇ 0.5 mm and the strength of ferrocoke.
  • the horizontal axis represents the ratio (% by mass) of the granular material of ⁇ 0.5 mm of the iron raw material
  • the vertical axis represents the strength (%) of ferrocoke.
  • the strength of ferro-coke was evaluated with a drum strength of 150 rotations and a 15 mm index (DI 150 15 ) using a drum tester.
  • the drum strength was measured according to the following procedure. First, 10 kg of carbonized ferrocoke is sieved with a sieve having an opening of 20 mm, and the sieve top is used as a sample. The sample is placed in a rotating drum defined in JIS K 2151 (1977). The rotating drum is rotated 150 times at 15 ⁇ 0.5 rpm.
  • a sample is taken out from the rotating drum and sieved with a sieve having an opening of 15 mm, and the percentage of the mass on the sieve with respect to the total mass of the sample is calculated to obtain one measured value. This measurement was performed twice, and the average of the two measurements was taken as the strength (%) of ferrocoke.
  • the target for the strength of the ferro-coke is set to 81.0% for the purpose of ensuring the air permeability of the blast furnace.
  • the evaluated ferro-coke is an egg-shaped mixture of 30 mm ⁇ 25 mm ⁇ 18 mm in a mixed raw material in which an iron raw material in a proportion of 30% by mass is mixed with coal based on the mass of the mixed raw material in which coal and iron raw material are mixed. Molded into briquettes and then produced by dry distillation.
  • the white circle plot shows the result of ferro-coke using iron ore as an iron raw material.
  • the black circle plot shows the result of ferro-coke using iron ore as the raw material.
  • the target strength is 81.0% when the proportion of the granular material that is ⁇ 0.5 mm is 20 to 80% by mass. Exceeded.
  • the ratio of the granular material having ⁇ 0.5 mm was less than 20% by mass, the strength of ferrocoke was lowered. This is thought to be due to the fact that the coarse granular material of the iron raw material increases in the ferro-coke, thereby generating a coarse defect structure in the ferro-coke, thereby reducing the strength of the ferro-coke.
  • the strength of the ferrocoke decreased even when the proportion of the granular material having ⁇ 0.5 mm was more than 80% by mass. This is because the surface area of the granular material becomes too large due to an increase in the fine granular material of the iron raw material in the ferrocoke, and the amount of the binder per unit surface area is decreased, thereby reducing the strength of the ferrocoke. .
  • ferro-coke manufacturing method In the ferro-coke manufacturing method according to the present embodiment, coal and iron raw materials are mixed to obtain a mixed raw material, and the mixed raw material is molded and dry-distilled to manufacture ferro-coke. From the results shown in FIGS. 1 and 2, returning iron is used as the iron raw material, with the ratio of the granular material becoming ⁇ 0.5 mm in the range of 25 to 80% by mass. In this way, by using the return mineral in the range of 25 to 80% by mass of the granular material that becomes ⁇ 0.5 mm for the ferrocoke, the ferrocoke reactivity is maintained while maintaining the target strength of the ferrocoke. Can be increased.
  • a return ore in which the ratio of the granular material that is -0.5 mm is in the range of 30 to 80% by mass.
  • a return ore in which the ratio of the granular material that is ⁇ 0.5 mm is in the range of 40 to 70% by mass.
  • the ratio of the granular material that becomes -0.5 mm by pulverizing the returned ore generated in the sintering step is adjusted within a predetermined range.
  • the pulverizer used for pulverization of the return mineral may be any pulverizer that can pulverize the return mineral within the target particle size range. For example, if a rotary pulverizer is used, the rotational speed is changed. Particle size control may be performed.
  • the returned ore with the ratio of the granular material having ⁇ 0.5 mm in a specific range was further sieved using a sieve having an opening of 2.0 to 3.0 mm, and thus obtained.
  • sieving return as an iron raw material for ferrocoke.
  • the sieve opening used is less than 2.0 mm because the yield of the iron raw material is lowered.
  • the sieve opening to be used is larger than 3.0 mm because coarse particles cannot be sufficiently eliminated.
  • the iron raw material may contain iron ore, dust containing iron, or the like in addition to the return ore.
  • FIG. 8 is a graph showing the relationship between the ratio of the iron raw material to the mass of the mixed raw material and the reactivity of ferrocoke.
  • the horizontal axis represents the ratio (mass%) of the iron raw material to the mass of the mixed raw material
  • the vertical axis represents the carbon reaction rate (%).
  • the carbon reaction rate was calculated as the mass change rate of carbon before and after the test by performing the load softening test described with reference to FIGS.
  • the evaluated ferro-coke is a mixture of raw materials mixed with a mixture of coal and iron raw material, with the ratio of the iron raw material changed, and molded into an egg-shaped briquette of dimensions 30 mm ⁇ 25 mm ⁇ 18 mm, Thereafter, it was produced by dry distillation.
  • iron raw materials iron ore (white circle plot) in which the proportion of granular materials to be ⁇ 0.5 mm was 20% by mass (white circle plot), iron ore in which the proportion of granular materials to be ⁇ 0.5 mm was 40% by mass (white) (Triangular plot), return ore (black circle plot) with 20% by mass of granular material at -0.5 mm, return mineral (black triangle plot) with 40% by mass of granular material at -0.5 mm
  • five kinds of return ore (black square plot) in which the ratio of the granular material to be ⁇ 0.5 mm was 70% by mass were used.
  • the return mineral having a proportion of granular material of ⁇ 0.5 mm is 20% by mass. It can be seen that the reaction rate of carbon is higher in the ferro coke made from the raw material. This is because, as described above, the return ore contains Ca, and Ca acts as a carbon gasification reaction catalyst. Therefore, due to this catalytic effect, the return ore is used as the raw material compared to the case where iron ore is used as the raw material. It is considered that the carbon reaction rate was improved in the case of the above. Furthermore, the effect of improving the reaction rate of carbon by converting iron ore into an ore was further increased by setting the proportion of the granular material having ⁇ 0.5 mm to 40% by mass.
  • the carbon reaction rate increases as the proportion of particulate matter of -0.5 mm increases, and the carbon reaction rate greatly increases even when the proportion using iron raw materials is low Was. This is because by increasing the proportion of the granular material that is -0.5 mm, the contact area between the return ore that is the catalyst and coke increases, and a large catalytic effect is exhibited even when the mixing ratio of the iron raw material is low. It is thought that. On the other hand, when the ratio of the granular material of ⁇ 0.5 mm of the iron raw material is reduced, the carbon reaction rate is lowered.
  • a reduction in the proportion of the granular material of ⁇ 0.5 mm of the iron raw material means an increase in the proportion of the granular material of +0.5 mm. For this reason, it can be said that the reaction rate of carbon falls when the ratio of the granular material which becomes +0.5 mm of an iron raw material increases.
  • the carbon reaction rate can be greatly improved if the return ore is used in an amount of 2% by mass or more based on the mass of the mixed raw material.
  • FIG. 9 is a graph showing the relationship between the ratio of the iron raw material to the mass of the mixed raw material and the strength of ferrocoke.
  • the horizontal axis represents the ratio (mass%) of the iron raw material to the mass of the mixed raw material
  • the vertical axis represents the strength (mass%) of ferrocoke.
  • the strength of ferro-coke was evaluated using the drum strength 150 rotation 15 mm index (DI 150 15 ) described in FIG.
  • the white circle plot shows the relationship between the strength and strength of ferro-coke using iron ore as the iron material
  • the black circle plot shows the proportion of ferro-coke iron material using return ore as the iron material. And the relationship between strength.
  • FIG. 9 shows that the strength at the same ratio is almost the same between return ore and iron ore, but the strength of the ferro-coke decreased as the ratio of the iron raw material increased regardless of which was used. In particular, when the ratio of the iron raw material was set to 20% by mass or more, the strength reduction of ferrocoke became large.
  • FIG. 9 shows that in order to improve the strength of ferro-coke, it is desirable that the ratio of the iron raw material to the mass of the mixed raw material is 10% by mass or less.
  • FIG. 10 is a graph showing the relationship between the ratio of the granular material of iron raw material of ⁇ 0.5 mm and the strength of ferro-coke.
  • the horizontal axis represents the ratio (% by mass) of the granular material of ⁇ 0.5 mm of the iron raw material
  • the vertical axis represents the strength (%) of ferrocoke. Note that the ferro-coke, which was evaluated for the relationship between the ratio of the granular material having ⁇ 0.5 mm and the strength of the ferro-coke, is ferro-coke using an iron raw material of 5 mass% with respect to the mass of the mixed raw material.
  • the white circle plot shows the relationship between the strength of the ferro-coke with -0.5 mm of ferro-coke containing iron ore as an iron raw material and the strength
  • the black circle plot shows a ferro-coating containing return ore as an iron raw material.
  • strength is shown. From FIG. 10, the relationship between the ratio and the strength of the granular material of ⁇ 0.5 mm is almost the same between the return ore and the iron ore, but in either case, the granular material of ⁇ 0.5 mm is used. When the ratio was in the range of 40 to 70% by mass, the strength of ferrocoke increased.
  • the strength of ferrocoke was lowered. This is presumably because coarse ferrocoke produced a coarse defect structure in the ferro-coke due to an increase in coarse particles of the iron raw material in the ferro-coke, thereby reducing the strength of the ferro-coke.
  • the strength of the ferrocoke decreased even when the proportion of the granular material having ⁇ 0.5 mm was more than 70% by mass. This is probably because the surface area of the particles becomes too large due to an increase in the fine granular material of the iron raw material in the ferrocoke, and the amount of the binder per unit surface area decreases, thereby reducing the strength of the ferrocoke.
  • the return ore within the range of 40 to 70% by mass of the granular material that becomes ⁇ 0.5 mm is in the range of 2 to 10% by mass with respect to the mass of the mixed raw material. It turns out that the intensity
  • the ratio of using the return mineral is less than 2% by mass with respect to the mass of the mixed raw material, the reactivity of the ferrocoke is rapidly lowered as shown in FIG. Is more than 10% by mass with respect to the mass of the mixed raw material, the strength of ferrocoke is lowered, which is not preferable.
  • the amount of the iron raw material in the ferro-coke can be reduced by using the return ore at a ratio in the range of 2 to 10% by mass with respect to the mass of the mixed raw material. By reducing the amount of iron raw material, the carbonization / reduction time in the drying process in the production of ferro-coke can be shortened. As a result, it is possible to reduce energy consumption and increase ferro-coke production.
  • return ore is used as the iron raw material for ferro-coke.
  • the present invention is not limited to this. Mixing of return ore within the range of 40 to 70% by mass of the granular material that is ⁇ 0.5 mm is possible. If the reaction rate of carbon of ferro-coke produced when used at a ratio in the range of 2 to 10% by mass with respect to the mass of the raw material can be higher than about 20%, the iron raw material can be iron ore in addition to return ore. It may contain dust containing stones or iron.
  • Example 1 an example of a ferro-coke manufacturing method capable of enhancing the reactivity of ferro-coke while maintaining the strength of ferro-coke above a certain level will be described.
  • coal and an iron raw material were mixed to obtain a mixed raw material.
  • the iron raw material was used at a ratio of 30% by mass with respect to the mass of the mixed raw material.
  • a binder was added to the mixed raw material in an amount of 5% by mass based on the mass of the mixed raw material, and the mixture was kneaded at 140 to 160 ° C. for 2 minutes.
  • As the binder 3% by mass of coal-based soft pitch (SOP) and 2% by mass of asphalt pitch (ASP) were used.
  • SOP coal-based soft pitch
  • ASP asphalt pitch
  • the size of the roll of the molding machine molding the kneaded raw material was 650 mm in diameter ⁇ 100 mm in width, and was molded at a roll rotation speed of 6 rpm and a molding pressure of 4 t / cm.
  • the molded product is egg-shaped, and the size is 30 mm ⁇ 25 mm ⁇ 18 mm (6 cc).
  • the molded product was continuously carbonized in a vertical-type carbonization furnace having a height of 3 m to produce ferro-coke.
  • the inside of the carbonization furnace is heated up to 600 ° C. at a heating rate of 10 ° C./min. From 600 ° C. to 850 ° C., the temperature is raised at a heating rate of 3 ° C./min.
  • the molding was dry-distilled while maintaining the temperature.
  • iron ore or crushed ore was used.
  • a pulverizer a cage mill was used, and the particle sizes of iron ore and return were adjusted by changing the rotation speed of the pulverizer.
  • ferro-coke in which the particle size of the iron raw material was adjusted, the influence of the ratio of the granular material of ⁇ 0.5 mm of the iron raw material on the strength of ferro-coke and the reactivity of ferro-coke was confirmed.
  • sieving was performed using a sieve having an opening of 3.0 mm, and only the sieving was used as the iron raw material.
  • the strength of ferro-coke was evaluated using a drum strength of 150 rotations and a 15 mm index (DI 150 15 ).
  • the reactivity of ferrocoke was evaluated by the reaction rate of carbon in ferrocoke.
  • the target strength in Example 1 was 81.0% with a drum strength of 150 rotations and a 15 mm index (DI 150 15 ).
  • Comparative Examples 1 to 3 are ferro-coke produced using iron ore as an iron raw material.
  • Comparative Example 1 is a ferro-coke using iron ore in which the proportion of the granular material that is -0.5 mm is 25% by mass.
  • the strength of the ferro-coke of Comparative Example 1 was 81.1% exceeding the target strength, and the carbon reaction rate was 18.8%.
  • Comparative Example 2 is ferro-coke that uses iron ore with a ratio of particulates of 0.5 mm, aiming at improving the reactivity of ferro-coke to -0.5 mm.
  • the strength of the ferro-coke of Comparative Example 2 was 81.0%, which was equal to the target strength, and the carbon reaction rate was 29.2%.
  • the strength of the ferrocoke of Comparative Example 2 is maintained at the target strength of 81.0%, The reaction rate was improved to 29.2%, and the reactivity of ferrocoke was improved.
  • Comparative Example 3 is a ferro-coke using iron ore in which the proportion of granular material with a size of 0.5 mm is 85% by mass with the aim of further improving the reactivity.
  • the strength of the ferro-coke of Comparative Example 3 was 80.0%, which was lower than the target strength, and the carbon reaction rate was 29.6%.
  • the carbon reaction rate of Comparative Example 3 is improved to 29.6%, and the reactivity of ferrocoke is Improved.
  • the strength of the ferro-coke of Comparative Example 3 was lower than the target strength.
  • Comparative Examples 4 to 6 and Invention Examples 1 to 3 are ferro-coke using return ore as an iron raw material.
  • Comparative Example 4 is a ferro-coke using a return ore with a ratio of granular materials of ⁇ 0.5 mm being 20% by mass.
  • the strength of the ferro-coke of Comparative Example 4 was 81.0%, which is the target strength, and the carbon reaction rate was 27.2%.
  • the carbon reaction rate was lower than that of Comparative Example 2
  • the reactivity of ferrocoke was Comparative Example 2 using iron ore as the iron raw material. Than that.
  • Comparative Example 5 is a ferro-coke using the returned ore used in Comparative Example 4 by sieving it with a sieve having an opening of 3.0 mm, and using the returned ore that has been sieved. Since the sieving is performed with a sieve having a mesh size of 3.0 mm, coarse particles are removed in the return ore used in Comparative Example 5 to 3.0 mm or less (hereinafter described as “ ⁇ 3.0 mm”). Is 100% by mass.
  • the strength of the ferrocoke of Comparative Example 5 was 81.2% exceeding the target strength, and the carbon reaction rate was 27.6%. By removing the coarse particles, the strength and reactivity of the ferrocoke of Comparative Example 5 were improved as compared with Comparative Example 4. However, the carbon reaction rate of Comparative Example 5 was lower than that of Comparative Example 2, and the reactivity of ferrocoke was lower than that of Comparative Example 2 using iron ore as the iron raw material.
  • Invention Example 1 is a ferro-coke using a return ore in which the proportion of the granular material having a value of ⁇ 0.5 mm is 25% by mass.
  • the strength of the ferrocoke of Invention Example 1 was 81.2% exceeding the target strength, and the carbon reaction rate was 29.4%.
  • the strength of ferrocoke became equal to or higher than the target strength by using the return mineral in which the ratio of the granular material having ⁇ 0.5 mm was 25% by mass.
  • the reaction rate of the carbon of Invention Example 1 was higher than that of Comparative Example 2, and the reactivity of ferrocoke was improved as compared with the case where iron ore was used as the iron raw material.
  • the proportion of the granular material having ⁇ 0.5 mm in Invention Example 1 as compared with Comparative Example 2 is as small as 25% by mass. For this reason, since an iron raw material can be easily grind
  • Invention Example 2 is a ferro-coke using the return ore obtained by sieving the return ore used in Invention Example 1 with a sieve having a mesh size of 3.0 mm. Since the sieving is performed with a sieve having a mesh size of 3.0 mm, coarse particles are removed in the return ore used in Invention Example 2, and the ratio of ⁇ 3.0 mm is 100% by mass. The strength of the ferrocoke of Invention Example 2 was 81.3% exceeding the target strength, and the carbon reaction rate was 29.7%. By removing coarse particles, the strength and reactivity of the ferrocoke of Invention Example 2 was improved as compared with Invention Example 1.
  • Invention Example 3 is a ferro-coke using a return ore with a ratio of the granular material of 0.5 mm aiming to improve the reactivity of the ferro-coke to 80% by mass.
  • the return ore of Invention Example 3 did not contain coarse particulate matter because the ratio of ⁇ 3.0 mm was 100% by mass without using a sieve having an opening of 3.0 mm.
  • the strength of the ferro-coke of Invention Example 3 was 81.0%, which is the target strength, and the carbon reaction rate was 43.8%.
  • the strength of the ferrocoke maintains the target strength, and the reactivity of the ferrocoke is the value of the invention example 1 and Improved over Invention Example 2.
  • Comparative Example 6 is a ferro-coke using a return ore with a ratio of granular material of ⁇ 0.5 mm aiming at further improvement in reactivity of 85% by mass.
  • the strength of the ferro-coke of Comparative Example 6 was 80.0% lower than the target strength, and the carbon reaction rate was 44.4%.
  • the reactivity of ferrocoke was improved as compared with Invention Example 3 by setting the proportion of the granular material to be -0.5 mm to 85 mass%, which is more than 80 mass%, but the strength was 80 It decreased to 0.0%, which was below the target strength of 81.0%.
  • Example 2 the same apparatus as in Example 1 was used for molding and dry distillation.
  • the iron material iron ore or crushed ore was used.
  • a pulverizer a cage mill was used, and the ratio of iron ore and granulated particles of -0.5 mm was adjusted by changing the rotation speed of the pulverizer.
  • Comparative Example 11 is coke containing no iron raw material.
  • the coke strength was 85.0%, and the carbon reaction rate was 8.0%.
  • Comparative Examples 12 and 13 are ferro-coke manufactured using iron ore as an iron raw material.
  • Comparative Example 12 is ferro-coke using iron ore in which the proportion of the granular material that is ⁇ 0.5 mm is 60% by mass with respect to the mass of the mixed raw material at 30% by mass.
  • the strength of the ferro-coke of Comparative Example 12 was 81.1%, which was significantly lower than that of coke.
  • the reaction rate of the carbon of the comparative example 12 was 26.8%, and the reactivity of the ferro-coke was greatly improved as compared with the coke.
  • Comparative Example 13 is a ferro-coke using iron ore in which the ratio of the granular material that is -0.5 mm is 60% by mass with respect to the mass of the mixed raw material at 5% by mass.
  • the strength of the ferro-coke of Comparative Example 13 was 85.0%, which was equivalent to the coke.
  • the carbon reaction rate of Comparative Example 13 was 17.5%, and the reactivity of ferrocoke was greatly reduced as compared with Comparative Example 12.
  • Comparative Examples 14 to 17 and Inventive Example 11 are ferro-coke manufactured using return ore as an iron raw material.
  • Comparative Example 14 is a ferro-coke using a return ore with a proportion of granular material of ⁇ 0.5 mm being 60% by mass at a rate of 15% by mass with respect to the mass of the mixed raw material.
  • the strength of the ferro-coke of Comparative Example 14 was 84.0%, which was slightly lower than that of the coke.
  • the reaction rate of the carbon of the comparative example 14 was 34.2%, and the reactivity of the ferro coke improved greatly by using a return ore.
  • Comparative Example 15 is a ferro-coke using a return ore having a ratio of granular material of ⁇ 0.5 mm of 20% by mass at a ratio of 5% by mass with respect to the mass of the mixed raw material.
  • the strength of the ferro-coke of Comparative Example 15 was 83.6%, which was slightly lower than that of the coke.
  • the carbon reaction rate of Comparative Example 15 was 15.0%, and the reactivity of ferrocoke was greatly reduced as compared with Comparative Example 12. This is probably because the strength of the ferro-coke was low and the reactivity was lowered because there was little return ore used in Comparative Example 15 and there were few granular materials that would be -0.5 mm of return ore.
  • Comparative Example 16 is ferro-coke using a return ore with a proportion of granular material of ⁇ 0.5 mm being 80% by mass at a rate of 5% by mass with respect to the mass of the mixed raw material.
  • the strength of the ferro-coke of Comparative Example 16 was 83.6%, which was slightly lower than that of the coke.
  • the reaction rate of the carbon of the comparative example 16 was 32.0%, and the reactivity of the ferro coke improved compared with the comparative example 12.
  • Comparative Example 16 although the amount of returned ore used was small, there were many granular materials with a return of ⁇ 0.5 mm, so it is considered that the reactivity of ferrocoke was improved.
  • Comparative Example 17 is a ferro-coke using a return ore having a ratio of particulates of ⁇ 0.5 mm of 60% by mass at a ratio of 1% by mass with respect to the mass of the mixed raw material.
  • the strength of the ferro-coke of Comparative Example 17 was 85.0%, which was equivalent to the coke.
  • the carbon reaction rate of Comparative Example 17 was 12.7%, and the reactivity of ferrocoke was greatly reduced as compared with Comparative Example 12. In Comparative Example 17, it was considered that the reactivity of the ferro-coke was lowered because the amount of returned ore used was too small.
  • Invention Example 11 is a ferro-coke using a return ore having a ratio of granular material of ⁇ 0.5 mm of 60% by mass at a ratio of 5% by mass with respect to the mass of the mixed raw material.
  • the strength of the ferro-coke of Invention Example 11 was 85.0%, which was equivalent to that of coke. Further, the carbon reaction rate of Invention Example 11 was 28.5%, and the reactivity of ferrocoke was improved as compared with Comparative Example 2. As described above, Invention Example 11 was able to achieve both the strength and the reaction rate.

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  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Coke Industry (AREA)
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Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2007169603A (ja) * 2005-11-28 2007-07-05 Jfe Steel Kk フェロコークスおよび焼結鉱の製造方法
JP2007177214A (ja) * 2005-11-30 2007-07-12 Jfe Steel Kk フェロコークスの製造方法

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JP2001288477A (ja) 2000-04-04 2001-10-16 Nippon Steel Corp 高炉用高反応性コークスの製造方法
JP2011084734A (ja) 2009-09-15 2011-04-28 Jfe Steel Corp フェロコークスの製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007169603A (ja) * 2005-11-28 2007-07-05 Jfe Steel Kk フェロコークスおよび焼結鉱の製造方法
JP2007177214A (ja) * 2005-11-30 2007-07-12 Jfe Steel Kk フェロコークスの製造方法

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